iPhone 5 Won't Email Pictures via Cell Network

Having issues trying to get my iPhone 5 send email picture files over my cell network (AT&T). Works fine over WiFi, but using the cell network it shows it's trying to send, then just goes to the Outbox where an error message says the outgoing server failed. I've tried rebooting the phone, with no changes.

I forgot to say that the issue is over AT&T's 4G network on my iPhone 5 and it doesn't seem to matter how small the picture files are, they just won't send. I'm not sure if it's an iPhone 5 issue or AT&T is to blame.

Spent over an hour with an AT&T rep over this issue. It seems to be resolved, but can take as long as 5 minutes for even a small (34 KB) picture file to email over their 4G network. This still seems off to me considering I'm consistently getting around 6 Mbps download speeds over their network.

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